drivers/thermal/int340x_thermal/int3400_thermal.c

   1 /*
   2  * INT3400 thermal driver
   3  *
   4  * Copyright (C) 2014, Intel Corporation
   5  * Authors: Zhang Rui <rui.zhang@intel.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/acpi.h>
  16 #include <linux/thermal.h>
  17 #include "acpi_thermal_rel.h"
  18
  19 #define INT3400_THERMAL_TABLE_CHANGED 0x83
  20
  21 enum int3400_thermal_uuid {
  22         INT3400_THERMAL_PASSIVE_1,
  23         INT3400_THERMAL_ACTIVE,
  24         INT3400_THERMAL_CRITICAL,
  25         INT3400_THERMAL_MAXIMUM_UUID,
  26 };
  27
  28 static char *int3400_thermal_uuids[INT3400_THERMAL_MAXIMUM_UUID] = {
  29         "42A441D6-AE6A-462b-A84B-4A8CE79027D3",
  30         "3A95C389-E4B8-4629-A526-C52C88626BAE",
  31         "97C68AE7-15FA-499c-B8C9-5DA81D606E0A",
  32 };
  33
  34 struct int3400_thermal_priv {
  35         struct acpi_device *adev;
  36         struct thermal_zone_device *thermal;
  37         int mode;
  38         int art_count;
  39         struct art *arts;
  40         int trt_count;
  41         struct trt *trts;
  42         u8 uuid_bitmap;
  43         int rel_misc_dev_res;
  44         int current_uuid_index;
  45 };
  46
  47 static ssize_t available_uuids_show(struct device *dev,
  48                                     struct device_attribute *attr,
  49                                     char *buf)
  50 {
  51         struct platform_device *pdev = to_platform_device(dev);
  52         struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
  53         int i;
  54         int length = 0;
  55
  56         for (i = 0; i < INT3400_THERMAL_MAXIMUM_UUID; i++) {
  57                 if (priv->uuid_bitmap & (1 << i))
  58                         if (PAGE_SIZE - length > 0)
  59                                 length += snprintf(&buf[length],
  60                                                    PAGE_SIZE - length,
  61                                                    "%s\n",
  62                                                    int3400_thermal_uuids[i]);
  63         }
  64
  65         return length;
  66 }
  67
  68 static ssize_t current_uuid_show(struct device *dev,
  69                                  struct device_attribute *devattr, char *buf)
  70 {
  71         struct platform_device *pdev = to_platform_device(dev);
  72         struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
  73
  74         if (priv->uuid_bitmap & (1 << priv->current_uuid_index))
  75                 return sprintf(buf, "%s\n",
  76                                int3400_thermal_uuids[priv->current_uuid_index]);
  77         else
  78                 return sprintf(buf, "INVALID\n");
  79 }
  80
  81 static ssize_t current_uuid_store(struct device *dev,
  82                                   struct device_attribute *attr,
  83                                   const char *buf, size_t count)
  84 {
  85         struct platform_device *pdev = to_platform_device(dev);
  86         struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
  87         int i;
  88
  89         for (i = 0; i < INT3400_THERMAL_MAXIMUM_UUID; ++i) {
  90                 if ((priv->uuid_bitmap & (1 << i)) &&
  91                     !(strncmp(buf, int3400_thermal_uuids[i],
  92                               sizeof(int3400_thermal_uuids[i]) - 1))) {
  93                         priv->current_uuid_index = i;
  94                         return count;
  95                 }
  96         }
  97
  98         return -EINVAL;
  99 }
 100
 101 static DEVICE_ATTR_RW(current_uuid);
 102 static DEVICE_ATTR_RO(available_uuids);
 103 static struct attribute *uuid_attrs[] = {
 104         &dev_attr_available_uuids.attr,
 105         &dev_attr_current_uuid.attr,
 106         NULL
 107 };
 108
 109 static const struct attribute_group uuid_attribute_group = {
 110         .attrs = uuid_attrs,
 111         .name = "uuids"
 112 };
 113
 114 static int int3400_thermal_get_uuids(struct int3400_thermal_priv *priv)
 115 {
 116         struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL};
 117         union acpi_object *obja, *objb;
 118         int i, j;
 119         int result = 0;
 120         acpi_status status;
 121
 122         status = acpi_evaluate_object(priv->adev->handle, "IDSP", NULL, &buf);
 123         if (ACPI_FAILURE(status))
 124                 return -ENODEV;
 125
 126         obja = (union acpi_object *)buf.pointer;
 127         if (obja->type != ACPI_TYPE_PACKAGE) {
 128                 result = -EINVAL;
 129                 goto end;
 130         }
 131
 132         for (i = 0; i < obja->package.count; i++) {
 133                 objb = &obja->package.elements[i];
 134                 if (objb->type != ACPI_TYPE_BUFFER) {
 135                         result = -EINVAL;
 136                         goto end;
 137                 }
 138
 139                 /* UUID must be 16 bytes */
 140                 if (objb->buffer.length != 16) {
 141                         result = -EINVAL;
 142                         goto end;
 143                 }
 144
 145                 for (j = 0; j < INT3400_THERMAL_MAXIMUM_UUID; j++) {
 146                         guid_t guid;
 147
 148                         guid_parse(int3400_thermal_uuids[j], &guid);
 149                         if (guid_equal((guid_t *)objb->buffer.pointer, &guid)) {
 150                                 priv->uuid_bitmap |= (1 << j);
 151                                 break;
 152                         }
 153                 }
 154         }
 155
 156 end:
 157         kfree(buf.pointer);
 158         return result;
 159 }
 160
 161 static int int3400_thermal_run_osc(acpi_handle handle,
 162                                 enum int3400_thermal_uuid uuid, bool enable)
 163 {
 164         u32 ret, buf[2];
 165         acpi_status status;
 166         int result = 0;
 167         struct acpi_osc_context context = {
 168                 .uuid_str = int3400_thermal_uuids[uuid],
 169                 .rev = 1,
 170                 .cap.length = 8,
 171         };
 172
 173         buf[OSC_QUERY_DWORD] = 0;
 174         buf[OSC_SUPPORT_DWORD] = enable;
 175
 176         context.cap.pointer = buf;
 177
 178         status = acpi_run_osc(handle, &context);
 179         if (ACPI_SUCCESS(status)) {
 180                 ret = *((u32 *)(context.ret.pointer + 4));
 181                 if (ret != enable)
 182                         result = -EPERM;
 183         } else
 184                 result = -EPERM;
 185
 186         kfree(context.ret.pointer);
 187         return result;
 188 }
 189
 190 static void int3400_notify(acpi_handle handle,
 191                         u32 event,
 192                         void *data)
 193 {
 194         struct int3400_thermal_priv *priv = data;
 195         char *thermal_prop[5];
 196
 197         if (!priv)
 198                 return;
 199
 200         switch (event) {
 201         case INT3400_THERMAL_TABLE_CHANGED:
 202                 thermal_prop[0] = kasprintf(GFP_KERNEL, "NAME=%s",
 203                                 priv->thermal->type);
 204                 thermal_prop[1] = kasprintf(GFP_KERNEL, "TEMP=%d",
 205                                 priv->thermal->temperature);
 206                 thermal_prop[2] = kasprintf(GFP_KERNEL, "TRIP=");
 207                 thermal_prop[3] = kasprintf(GFP_KERNEL, "EVENT=%d",
 208                                 THERMAL_TABLE_CHANGED);
 209                 thermal_prop[4] = NULL;
 210                 kobject_uevent_env(&priv->thermal->device.kobj, KOBJ_CHANGE,
 211                                 thermal_prop);
 212                 break;
 213         default:
 214                 dev_err(&priv->adev->dev, "Unsupported event [0x%x]\n", event);
 215                 break;
 216         }
 217 }
 218
 219 static int int3400_thermal_get_temp(struct thermal_zone_device *thermal,
 220                         int *temp)
 221 {
 222         *temp = 20 * 1000; /* faked temp sensor with 20C */
 223         return 0;
 224 }
 225
 226 static int int3400_thermal_get_mode(struct thermal_zone_device *thermal,
 227                                 enum thermal_device_mode *mode)
 228 {
 229         struct int3400_thermal_priv *priv = thermal->devdata;
 230
 231         if (!priv)
 232                 return -EINVAL;
 233
 234         *mode = priv->mode;
 235
 236         return 0;
 237 }
 238
 239 static int int3400_thermal_set_mode(struct thermal_zone_device *thermal,
 240                                 enum thermal_device_mode mode)
 241 {
 242         struct int3400_thermal_priv *priv = thermal->devdata;
 243         bool enable;
 244         int result = 0;
 245
 246         if (!priv)
 247                 return -EINVAL;
 248
 249         if (mode == THERMAL_DEVICE_ENABLED)
 250                 enable = true;
 251         else if (mode == THERMAL_DEVICE_DISABLED)
 252                 enable = false;
 253         else
 254                 return -EINVAL;
 255
 256         if (enable != priv->mode) {
 257                 priv->mode = enable;
 258                 result = int3400_thermal_run_osc(priv->adev->handle,
 259                                                  priv->current_uuid_index,
 260                                                  enable);
 261         }
 262         return result;
 263 }
 264
 265 static struct thermal_zone_device_ops int3400_thermal_ops = {
 266         .get_temp = int3400_thermal_get_temp,
 267 };
 268
 269 static struct thermal_zone_params int3400_thermal_params = {
 270         .governor_name = "user_space",
 271         .no_hwmon = true,
 272 };
 273
 274 static int int3400_thermal_probe(struct platform_device *pdev)
 275 {
 276         struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
 277         struct int3400_thermal_priv *priv;
 278         int result;
 279
 280         if (!adev)
 281                 return -ENODEV;
 282
 283         priv = kzalloc(sizeof(struct int3400_thermal_priv), GFP_KERNEL);
 284         if (!priv)
 285                 return -ENOMEM;
 286
 287         priv->adev = adev;
 288
 289         result = int3400_thermal_get_uuids(priv);
 290         if (result)
 291                 goto free_priv;
 292
 293         result = acpi_parse_art(priv->adev->handle, &priv->art_count,
 294                                 &priv->arts, true);
 295         if (result)
 296                 dev_dbg(&pdev->dev, "_ART table parsing error\n");
 297
 298         result = acpi_parse_trt(priv->adev->handle, &priv->trt_count,
 299                                 &priv->trts, true);
 300         if (result)
 301                 dev_dbg(&pdev->dev, "_TRT table parsing error\n");
 302
 303         platform_set_drvdata(pdev, priv);
 304
 305         if (priv->uuid_bitmap & 1 << INT3400_THERMAL_PASSIVE_1) {
 306                 int3400_thermal_ops.get_mode = int3400_thermal_get_mode;
 307                 int3400_thermal_ops.set_mode = int3400_thermal_set_mode;
 308         }
 309         priv->thermal = thermal_zone_device_register("INT3400 Thermal", 0, 0,
 310                                                 priv, &int3400_thermal_ops,
 311                                                 &int3400_thermal_params, 0, 0);
 312         if (IS_ERR(priv->thermal)) {
 313                 result = PTR_ERR(priv->thermal);
 314                 goto free_art_trt;
 315         }
 316
 317         priv->rel_misc_dev_res = acpi_thermal_rel_misc_device_add(
 318                                                         priv->adev->handle);
 319
 320         result = sysfs_create_group(&pdev->dev.kobj, &uuid_attribute_group);
 321         if (result)
 322                 goto free_zone;
 323
 324         result = acpi_install_notify_handler(
 325                         priv->adev->handle, ACPI_DEVICE_NOTIFY, int3400_notify,
 326                         (void *)priv);
 327         if (result)
 328                 goto free_zone;
 329
 330         return 0;
 331
 332 free_zone:
 333         thermal_zone_device_unregister(priv->thermal);
 334 free_art_trt:
 335         kfree(priv->trts);
 336         kfree(priv->arts);
 337 free_priv:
 338         kfree(priv);
 339         return result;
 340 }
 341
 342 static int int3400_thermal_remove(struct platform_device *pdev)
 343 {
 344         struct int3400_thermal_priv *priv = platform_get_drvdata(pdev);
 345
 346         acpi_remove_notify_handler(
 347                         priv->adev->handle, ACPI_DEVICE_NOTIFY,
 348                         int3400_notify);
 349
 350         if (!priv->rel_misc_dev_res)
 351                 acpi_thermal_rel_misc_device_remove(priv->adev->handle);
 352
 353         sysfs_remove_group(&pdev->dev.kobj, &uuid_attribute_group);
 354         thermal_zone_device_unregister(priv->thermal);
 355         kfree(priv->trts);
 356         kfree(priv->arts);
 357         kfree(priv);
 358         return 0;
 359 }
 360
 361 static const struct acpi_device_id int3400_thermal_match[] = {
 362         {"INT3400", 0},
 363         {}
 364 };
 365
 366 MODULE_DEVICE_TABLE(acpi, int3400_thermal_match);
 367
 368 static struct platform_driver int3400_thermal_driver = {
 369         .probe = int3400_thermal_probe,
 370         .remove = int3400_thermal_remove,
 371         .driver = {
 372                    .name = "int3400 thermal",
 373                    .acpi_match_table = ACPI_PTR(int3400_thermal_match),
 374                    },
 375 };
 376
 377 module_platform_driver(int3400_thermal_driver);
 378
 379 MODULE_DESCRIPTION("INT3400 Thermal driver");
 380 MODULE_AUTHOR("Zhang Rui <rui.zhang@intel.com>");
 381 MODULE_LICENSE("GPL");